Houka joined Rocks and used his knowledge of the future to help build the Rocks Pirates, recruiting powerful fighters and gaining new abilities. After defeating Silver Axe Xiong in a challenge, the crew left the ruined island together, with its next recruits and Newgate’s pursuit of Murakumogiri still ahead.
Rocks formed his crew into a growing force, raided Ying Kingdom, and recruited Charlotte Linlin before taking Elysium Island from Ochoku. As the island became the Rocks Pirates’ base and drew new recruits, Houka strengthened his position within the crew and Gier Buster challenged Silver Axe Xiong.
Houka became the Rocks Pirates’ temporary leader while Rocks returned to his family, and the crew seized Napoleon and recruited Malone. The arc ended with events unfolding elsewhere, including Redfield’s encounter with the Rumbar Pirates and the Shimotsuki clan’s journey toward the East Blue.
Houka became vice captain of the Rocks Pirates as the crew recruited Fugetsu Kizaburo and traveled to Ohara and Red Earth Island. The Five Elders sent the Holy Knights after the divided crew, while Houka sensed Figarland Garling’s forces closing in on Ohara.
Houka escaped the Five Elders, gathered new Devil Fruit powers, and turned the Rainbow Mist into a pocket world while the Rocks Pirates grew more notorious. After reuniting with the crew, he pursued the Shimotsuki family and declared that Wano needed a new leader.
Houka destroyed Enies Lobby, expanded his powers, and strengthened the Rocks Pirates while the World Government considered recruiting him. After securing the Lucky-Lucky Fruit and starting a family with Stussy and Shimotsuki Furiko, Houka led the crew to Elbaf, where he encountered Loki and recognized Sister Carmel within Linlin.
Houka helped Linlin overcome Carmel’s attempt to seize her, then brought the Rocks Pirates to Elbaf and worked to win the Giants’ trust while warning Harald about the World Government. The crew gained Redfield and prepared to protect Red Earth Island, while Harald remained wary and Loki wanted to join the pirates.
Houka and the Rocks Pirates founded an empire and expanded the New World Alliance while preparing to confront the Celestial Dragons’ Human Purge Competition. After Rocks defeated Roger, Houka secured the Roger Pirates as allies, and the combined crews headed back toward the New World.
Houka gathered allies and prepared the Rocks and Roger Pirates for an assault on Red Earth Island, where the Celestial Dragons were holding a human hunt. The raid began with the island’s people being rescued, the Celestial Dragons’ crimes exposed, and Houka fighting the Holy Knights as reinforcements arrived.
Kozuki Houka and the Rocks Pirates defeated the World Government’s forces on Red Earth Island, exposed the Celestial Dragons’ crimes, and gathered spoils and allies. Houka rescued Erza and the Davy Clan from God Valley before the crew sailed toward Red Earth Island amid rising bounties and renewed efforts to reveal Imu.
Houka led the Rocks Pirates and the Giants to Punk Hazard, where they found the Great Hammer Warband frozen in an ancient laboratory. He exposed Imu’s control over the World Government, bargained for Devil Fruits, and revealed his Nika form before continuing to deceive the Five Elders.
Houka brought the Rocks Pirates and the giants to Wano, where they found Pluton and began salvaging it while he expanded his alliance and negotiated with Imu. The arc ended with Pluton raised from the seabed, Houka’s golden form alarming the World Government, and Imu seeking a new bargain with him.
Houka gathered allies, Devil Fruits, and Pluton while deceiving the World Government and building his forces. As the World Government advanced on Elysium Island, Loki awakened his Conqueror’s Haki and joined Houka’s side for the coming battle.
Houka helped the Rocks Pirates and their allies battle Imu, the Holy Knights, and the World Government fleet, while Loki’s Nidhogg power proved vital against Imu’s contracts. Houka finally arrived with reinforcements and turned the tide, then rushed to Rocks and Harald’s battlefield to keep Imu from controlling them.
Houka saved his allies from Imu, built up the Sacred Ancient Moon Empire, and led the alliance back into the New World. After giving Rocks the Dark-Dark Fruit, Houka and the Rocks Pirates raced Golden Lion Shiki and other powers to claim the Griffin Fruit.
Houka and Rocks led their allies into a war against Imu, who detonated the sun and left Houka, Rocks, and Loki near death. The survivors escaped to the Lost World, where Lu Ya showed signs of sun power and Houka awoke after healing, discovering that Gu Yue Shenwei had gained Soul Fire.
Houka raided Mary Geoise, then returned to Elbaf to confront Imu as the World Government’s forces and the Rocks Pirates fought across the island. Imu reclaimed the power and lives tied to the Deep Sea Contracts and reached God-level Conqueror’s Haki, leaving Houka and his allies to battle on while many fighters withdrew.
Houka rebuilt his strength, relocated the Tontatta and prepared to move Fish-Man Island while the World Government rebuilt its forces under Imu. As Houka’s family explored Treasure Beast Island, he found Lily Carnation and gave it the Human-Human Fruit.
Houka investigated Davy Jones and the ancient gods while strengthening his family, awakening Rocks and Loki, and preparing for war with Imu. The arc ends as both sides converge on G-1 and Houka reveals his Sun God Nika transformation.
Houka and his allies drove Imu from the battlefield, freed several allies from Imu’s contracts, and captured Davy Jones in a controlled Seraphim body. After helping Rocks reunite with Teach and claiming Davy Jones’s treasure, Houka resumed his plans while a mysterious ship appeared in the Rainbow Mist.